Boston Weather in January
January brings the year's coldest and snowiest weather to Boston, Massachusetts.
This page gives detailed information on the typical January weather for Boston.
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The numbers here are historical averages based on climate data gathered at Boston's Logan International Airport, located on the waterfront next to Boston Harbor.
|36 °F||January average high||2 °C|
|22 °F||January average low||-5 °C|
In most years, Boston averages a daily maximum temperature for January that's between 31 and 40 degrees Fahrenheit (0 to 5 degrees Celsius). The minimum temperature usually falls between 17 and 27 °F (-8 to -3 °C).
January is the coldest month overall for Boston and the 17th to 20th are its chilliest days. They have daily highs averaging 35.4 °F (1.9 °C) and lows of 21.7 °F (-5.7 °C).
|10 days||40 °F max. or more (4 °C)|
|12 days||20 °F min. or less (-8 °C)|
Boston averages 3 days in January when the thermometer reaches into the 50s °F (over 10 °C). Temperatures above 60 °F (16 °C) happen occasionally, although not every year. Typically on 11 days the mercury remains below freezing for the entire day.
At night, the thermometer dips to 10 °F (-12 °C) or below on 4 days. But most years, January does not get temperatures as cold as 0 °F (-18 °C).
|3.4 in||total precipitation||85 mm|
|11 days||of rain or snowfall|
Half the time, Boston receives 2 to 5 inches (59 to 117 mm) of precipitation in January. One in four years has drier weather, while another one in four is wetter.
|12.9 in||total snowfall||32.8 cm|
|7 days||with new snow|
While January is generally the month with the most snowfall in Boston, the amount that the city gets this month does vary a lot from year to year. Between 5 and 17 inches (12 to 43 cm) of fresh snow arrives in half the years. Less new snow lands in one out of four Januaries, while another twenty-five percent are snowier.
Boston typically has at least an inch (2.5 cm) of snow on the ground for 11 days this month. The snow normally accumulates to 10 inches (25 cm) or deeper on two days.
|9 days||clear skies|
The sun's rays reach the ground in Boston during 53 percent of daylight hours on average in January, for a total of 155 hours in the month. Typically on 9 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in January at Boston lasts for 9 hours and 29 minutes a day on average. The shortest day of the month is the 1st with 9 hours and 9 minutes of daylight. By the end of the month, the days have lengthened to 9:58 from sunrise to sunset. These durations of daylight can vary by a minute or two from year to year.
|62 %||January average humidity|
The relative humidity in Boston during January usually peaks at 67 percent in the morning then drops to 57 percent by early afternoon.
|Local Time||1 am||4 am||7 am||10 am||1 pm||4 pm||7 pm||10 pm|
|13.6 mph||January wind speed average||21.9 kph|
January is a little windier than most other months in Boston.
|4 days||snowfall of 5 inches (13 cm) or more|
|0 days||with thunderstorms in January|
Boston has a total of 4 days this month when it snows at least an inch (2.5 cm), more often than any other month.
About once in five years, a January thunderstorm passes over Boston.
These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity and thunderstorm statistics are 1961-1990 normals.